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  1. We present a first search for dark-trident scattering in a neutrino beam using a dataset corresponding to7.2×1020protons on target taken with the MicroBooNE detector at Fermilab. Proton interactions in the neutrino target at the main injector produceπ0andηmesons, which could decay into dark-matter (DM) particles mediated via a dark photonA. A convolutional neural network is trained to identify interactions of the DM particles in the liquid-argon time projection chamber (LArTPC) exploiting its imagelike reconstruction capability. In the absence of a DM signal, we provide limits at the 90% confidence level on the squared kinematic mixing parameterϵ2as a function of the dark-photon mass in the range10MA400MeV. The limits cover previously unconstrained parameter space for the production of fermion or scalar DM particlesχfor two benchmark models with mass ratiosMχ/MA=0.6and 2 and for dark fine-structure constants0.1αD1.

    Published by the American Physical Society2024 
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    Free, publicly-accessible full text available June 1, 2025
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